CK Vulpeculae
| Observation data Epoch J2000.0 Equinox J2000.0 |
|
|---|---|
| Constellation | Vulpecula |
| Right ascension | 19h 47m 38.0s [1] |
| Declination | +27° 18′ 48″ [1] |
| Apparent magnitude (V) | ~2.4 to ~6 while active |
| Characteristics | |
| Spectral type | ea |
| B−V color index | 0.7 |
| Variable type | Recurrent nova |
| Astrometry | |
| Distance | 1800 ly |
| Absolute magnitude (MV) | ~+10.4 |
| Other designations | |
CK Vulpeculae (also Nova Vulpeculae 1670) may be the oldest cataloged nova variable.[2] It consists of a central dim object with gas flowing out (~ 210 kilometres per second) into a bi-polar nebulous blob.[3] It is either inside of a cloud of cold (~ 15 Kelvin degrees) dust or the cloud is in front of it from the Earth's perspective. Molecular gas in the vicinity is rich in Nitrogen relative to Oxygen.[4] Models suggest CK Vulpeculae may not be a classic nova; rather it may be classified as a Luminous red nova which is the result of two main sequence stars colliding and merging.[4]
Eruptive history
CK Vulpeculae was discovered by Voituret Anthelme in 1670. It had a brightness maximum of approximately 3 magnitude on June 20, 1670 after which it faded. A second maxima was observed March 1671, after which Johannes Hevelius and Giovanni Cassini observed it throughout spring and summer until it faded from naked-eye view in late August 1671. A last weakly visible brightness maxima of approximately 5.5 to 6 magnitude was observed by Hevelius in March 1672 and finally faded from view late May. Observers from 1670 to 1672 noted the nova had a reddish colour. CK Vulpeculae was not detectable for centuries until recovered in 1981.[5]
References
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